San Luis ReservoirWater Level & Temperature
San Luis Reservoir water level & water temperature
San Luis Reservoir water level is updated continuously from the operating agency. Full pool elevation is 544 ft. Live reading, 7-day trend, and multi-year history appear below as the data loads.
San Luis Reservoir water temperature by month
San Luis Reservoir surface water temperature averages from about 53°F in January to 81°F in July over the year, based on a 40-year USGS model (1980–2020). Cold-water caution applies in January, February, March and December, when the typical temperature is below 60°F.
Jan
53°
Feb
55°
Mar
59°
Apr
65°
May
71°
Jun
77°
Jul
81°
Aug
80°
Sep
77°
Oct
70°
Nov
61°
Dec
54°
Typical surface temperatures (°F), modeled historical averages (USGS 185k-lake dataset, 1980–2020). Colors flag cold-water risk: blue/amber/red = cool, caution, danger. Live and recent readings appear above where a sensor is available.